Study On The Hysteretic Behavior Of The Steel Encased Concrete Structure Of Joint

The Steel Encased Concrete Structure as a new type of structural form，can play fullyexcellent features of steel and concrete,so it gradually become one of the primary structuresfor the high-rise and supper high-rise buildings. To Steel Encased Concrete Structure, thedesign and calculation of nodes is a key issue. Nodes are the key parts to connect beams andcolumns. Without these nodes, the internal forces of beams and columns can not be passedthrough. So safe and reliable of the nodes’ job is a premise to ensure the structural normalwork. Because of the complexity Stress, nodes usually are in bending-shear composite stressstate, so it is very important to research and find out the nodes’ tress performance and failuremechanism, to make the nodes’ design have a clear pass-force, reliable calculation andreasonable structure. In the complex earthquake, it is more important to attach the rational-right design of the nodes. Based on this, the experimental study on seismic behavior of frameside joint in steel encased concrete structure is presented and give theoretical evidence toproperly establish the design method.This paper studied the mechanical behavior, stress distribution and failure mechanism ofSteel Encased-concrete Structure of the side frame joints under horizontal monotonic load andcyclic loading, using the finite element software ANSYS. The experimental research of12SRC frame side joints，by changing axial compression ratio、concrete strength and stirrupratio,under the cyclic reversed loading have been carried out in this thesis. After that, basedon the results of the tests, the processes of load bearing failure mechanism are studied. Theseismic behavior of the SRC frame side joint is analyzed and the evaluation that affects theseismic behaviors by axial compression ratio、concrete strength grade and stirrup ratio havebeen discussed; At the same time, the ductility and the energy dissipation capacity have beenstudied. The strains of steel stirrup and section of the columns and beams in the joints core are analyzed. The results indicate the deformation capacity is improved by inserting profiledbar into the core of the column.The deformation capacity and the energy dissipating isimproved in a certain extent by increasing strength classes of concrete in a certain range.Thejoint crack resistance,rigidity and load-carrying capacity is improved obviously under axialcompressive force;with the ratio of axial compressive force increasing,the deformationcapacity and the energy dissipating of joint is improved in a small range in low ratio of axialcompressive force.With the increasing of the volume ratio of the shaped-steel the strength andrigidity of the component is increased gradually,the deformation capacity and the energydissipating is improved a little.Based on finite element analysis,the contribution of each part are determined andtheory and the practical calculating formulas of shear bearing capacity of SRC frame sidejoints is derived, the factor of brittle property of high concrete strength influencing on theshear capacity is determined, the influence of concrete strength and the stress of steel webplate are included.